I hope this question isn’t too silly. The doors of the wall cabinets that I bought from Home Depot do not have a mark or stamp that indicates where on the door panel edge one is to attached pull hardware. Is there a rule of thumb as to placement of a pull knob? These wall cabinest are 36″ x 36″ by 12″. There are three shelves inside. the base, 1/3 of the way up and 2/3 of the way up. The knobs are a simple brass, circular knob. If I had to guess, I would install the knobs about six inches from the bottom corner.